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【英文标准名称】:StandardTestMethodsforAxialCompressiveForcePulse(Rapid)TestingofDeepFoundations
【原文标准名称】:深地基轴向压力脉冲(快速)试验的标准试验方法
【标准号】:ASTMD7383-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D18.11
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:axialcompressiveforcepulse;displacementresponse;inertialreactionmass;rapidloadtest;ultimateaxialpilecapacity;Axialcompressiveforcepulse;Deepfoundationunits;Displacement
【摘要】:Basedonthemeasurementsofforceanddisplacementatthepiletop,possiblycombinedwiththosefromaccelerationorstraintransducerslocatedfurtherdownthepile,thesetestmethodsmeasurethepiletopdeflectioninresponsetoanaxialcompressiveforcepulse.Therelativelylongdurationoftheforcepulsecomparedtothenaturalperiodofthetestpilecausesthepiletocompressandtranslateapproximatelyasaunitduringaportionofthepulse,simultaneouslymobilizingcompressiveaxialstaticcapacityanddynamicresistanceatallpointsalongthelengthofthepileforthatportionofthetest.TheEngineermayanalyzetheacquireddatausingengineeringprinciplesandjudgmenttoevaluatetheperformanceoftheforcepulseapparatus,andthecharacteristicsofthepile''sresponsetotheforcepulseloading.Ifsignificantpermanentaxialmovementoccursduringtheaxialforcepulseevent,theEngineermayanalyzetheresultsofthetesttoestimate,afterassessinginertialeffectsandthedynamicsoilandrockresponsealongthesideandbottomofthepile,theultimateaxialstaticcompressioncapacity(seeNote2).Thescopeofthisstandarddoesnotincludeanalysisforeitherultimateordesignfoundationcapacity.Factorsthatmayaffecttheaxialstaticcapacityestimatedfromforcepulsetestsinclude,butarenotlimitedto,the:(1)pileinstallationequipmentandprocedures,(2)elapsedtimesinceinitialinstallation,(3)pilematerialpropertiesanddimensions,(4)type,density,strength,stratification,andsaturationofthesoil,orrock,orbothadjacenttoandbeneaththepile,(5)qualityofforcepulsetestdata,(6)foundationsettlement,(7)analysismethod,and(8)engineeringjudgmentandexperience.IftheEngineerdoesnothaveadequatepreviousexperiencewiththesefactors,andwiththeanalysisofforcepulsetestdata,thenastaticloadtestcarriedoutaccordingtoTestMethodD1143shouldbeusedtoverifyestimatesofstaticcapacityanditsdistributionalongthepilelength.TestMethodD1143providesadirectandmorereliablemeasurementofstaticcapacity.Note28212;Ifaforcepulsetestproducesinsufficientaxialmovement,subsequentanalysismayoverestimatethestaticcapacitybecauseofdifficultyinseparatingthestaticanddynamiccomponentsoftheresponse.Theanalysisofaforcepulsetesttoestimatestaticcapacityalsotypicallyincludesareductionfactortoaccountfortheadditionalloadresistancethatoccursasaresultofafasterrateofloadingthanusedduringastatictest.Forcepulsetestresultsfromcohesivesoilsgenerallyrequireagreaterreductionfactorduetotherateofloadingeffect,chosenconservativelytoproducealowerstaticcapacityestimate.TheEngineershoulddeterminehowthetype,size,andshapeofthepile,andthepropertiesofthesoilorrockbeneathandadjacenttothepile,affecttherate-of-loadingreductionfactorsandtheamountofmovementrequiredtomobilizeandaccuratelyassessthestaticcapacity.Correlationsbetweenactualmeasurementsandforcepulseestimatesoftheultimateaxialstaticcompressioncapacitygenerallyimprovewhenusingadditionaltransducersembeddedinthepile.Staticcapacitymayalsochangeovertimeafterthepileinstallation,especiallyfordrivenpiles.Bothstaticandforcepulsetestsrepresentthecapacityatthetimeoftherespectivetest,andcorrelationattemptsshouldprovideresultsfora.......
【中国标准分类号】:P22
【国际标准分类号】:93_020
【页数】:9P.;A4
【正文语种】:英语